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MAGNETIC PROPERTIES OF FERRITE CORES UNDER DC - BIASED FIELD
H. Fukunaga,S. Masumoto,Y. Ohta,H. Kakehashi,H. Ogasawara 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.5
Ferrite cores are often magnetized under DC-biased field because they have been intensively used in electronic circuits such as an inverter circuit and a switching regulator circuit. Thus we investigated the effects of DC-biased field on magnetic properties in the frequency range of DC-100㎑ for two kinds of ferrite cores, TDK PC38 and TDK H₃S, which have different shapes of B-H loop from each other. The magnetic loss per cycle, W/f, in the H₃S core decreased with increasing the strength of DC-biased field, although W/f in the PC38 core increased monotonically with DC-biased field. The observed decreasing tendency differs from the previous result for Si-Fe and ferrite cores, and can be attributed to decrease in eddy current loss as well as that in hysteresis loss.
IMPROVEMENT IN HIGH FREQUENCY MAGNETIC PROPERTIES OF THIN AMORPHOUS RIBBONS BY SURFACE OXIDATION
K.Ooae,H.Fukunaga,H.Kakehashi,H.Ogasawara 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.5
The effects of surface oxidation on magnetic properties were investigated at high frequencies (10k-10㎒) for 7-18㎛ thick Co_(70)Fe_5Si_(15)B_(10) amorphous ribbons with controlled domain structure. Oxidation was accelerated by acid-treatment or anodic oxidation treatment, and the insulation layers were prepared on the surfaces of the ribbons. The acid-treatment was effective in improving permeability and magnetic loss. Although the anodic oxidation treatment was effective in both making oxide layer and thinning, the magnetic properties were not improved compared with the case of the acid-treatment.